EP2720077A1 - Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element - Google Patents

Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element Download PDF

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Publication number
EP2720077A1
EP2720077A1 EP12250162.0A EP12250162A EP2720077A1 EP 2720077 A1 EP2720077 A1 EP 2720077A1 EP 12250162 A EP12250162 A EP 12250162A EP 2720077 A1 EP2720077 A1 EP 2720077A1
Authority
EP
European Patent Office
Prior art keywords
lenticules
instrument
diffractive element
diffractive
optionally
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12250162.0A
Other languages
English (en)
French (fr)
Inventor
Graham Peter Francis Mercer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vision Engineering Ltd
Original Assignee
Vision Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vision Engineering Ltd filed Critical Vision Engineering Ltd
Priority to EP12250162.0A priority Critical patent/EP2720077A1/de
Priority to SG11201502895YA priority patent/SG11201502895YA/en
Priority to CA2888256A priority patent/CA2888256C/en
Priority to BR112015008249-1A priority patent/BR112015008249B1/pt
Priority to ES13721913T priority patent/ES2725327T3/es
Priority to JP2015536022A priority patent/JP6770314B2/ja
Priority to MX2015004666A priority patent/MX347629B/es
Priority to RU2015115314A priority patent/RU2623701C2/ru
Priority to PT13721913T priority patent/PT2906986T/pt
Priority to EP13721913.5A priority patent/EP2906986B1/de
Priority to CN201380056782.4A priority patent/CN104937474B/zh
Priority to DK13721913.5T priority patent/DK2906986T3/da
Priority to KR1020157012266A priority patent/KR102084487B1/ko
Priority to PCT/EP2013/057679 priority patent/WO2014056631A1/en
Priority to US14/435,364 priority patent/US10338284B2/en
Priority to MYPI2015000944A priority patent/MY175908A/en
Priority to TR2019/07010T priority patent/TR201907010T4/tr
Priority to AU2013329843A priority patent/AU2013329843A1/en
Publication of EP2720077A1 publication Critical patent/EP2720077A1/de
Priority to IL238284A priority patent/IL238284B/en
Priority to ZA2015/03040A priority patent/ZA201503040B/en
Priority to HK15112472.5A priority patent/HK1211706A1/xx
Priority to AU2017268585A priority patent/AU2017268585A1/en
Priority to CY20191100468T priority patent/CY1121752T1/el
Priority to AU2019271926A priority patent/AU2019271926B2/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1842—Gratings for image generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1847—Manufacturing methods
    • G02B5/1852—Manufacturing methods using mechanical means, e.g. ruling with diamond tool, moulding

Definitions

  • the present invention relates to optical instruments, especially microscopes, in particular optical instruments which have an exit pupil at which an image of an object may be viewed by an observer, and diffractive optical elements for use with the same.
  • the size of the exit pupil is determined by a function of the numerical aperture and overall magnification of the optical instrument, and hence the size of the exit pupil is of fixed and relatively-small dimension. Consequently, it is necessary for an observer to accurately align the entrance pupil of his/her eye with the exit pupil of the optical instrument in order properly to view an image.
  • the present applicant has previously developed a number of different optical instruments which, through the provision of a diffractive element at an intermediate image plane, provide an exit pupil which is effectively enlarged, allowing an observer to view an image by placing his/her eye anywhere within the enlarged exit pupil.
  • These optical instruments are disclosed in US-A-6028704 , US-A-6608720 and US-A-7123415 .
  • the present applicant has now developed improved optical instruments, which still provide an exit pupil which is effectively enlarged, but which can provide for greater optical clarity and avoid the need for a field lens arrangement, which, given the size of the field of view, usually represents the most expensive component within the optical instruments, being a precision-ground and polished glass component.
  • the present invention provides an optical instrument for producing an optical image to be viewed by an observer, the optical instrument comprising: an optical system for producing an optical image of an object which is viewable by an observer at an exit pupil; and a diffractive element located at an image plane of the optical system for producing an array of the exit pupils, which are perceivable as a single, enlarged exit pupil by the observer; wherein the diffractive element comprises a surface which has an array of diffractive units, each of which generates one of the exit pupils of the array of exit pupils, the diffractive units each comprising a lenticule, which is effective to produce diffractive interference of light and generate a plurality of exit pupils which are displaced relative to one another in the form of an array of exit pupils, the lenticules each comprising an irregular feature having a plurality of surfaces.
  • the lenticules have substantially a rectangular shape at the surface of the diffractive element.
  • the lenticules are formed on a radial spiral.
  • the lenticules are formed on a radial spiral at a radial spiral pitch of from about 40 ⁇ m to about 120 ⁇ m, optionally from about 40 ⁇ m to about 120 ⁇ m.
  • the pitch along the spiral is from about 40 ⁇ m to about 120 ⁇ m, optionally from about 70 ⁇ m to about 100 ⁇ m.
  • the lenticules have a width of from about 30 ⁇ m to about 100 ⁇ m, optionally from about 40 ⁇ m to about 70 ⁇ m.
  • the lenticules have a length of from about 30 ⁇ m to about 100 ⁇ m, optionally from about 50 ⁇ m to about 90 ⁇ m.
  • the lenticules each include a rectilinear lenticule surface which defines a lateral face and is tapered relative to the principal surface of the diffractive element.
  • the lateral face encloses an angle of from about 65 degrees to about 90 degrees relative to the surface of the diffractive element, optionally from about 75 degrees to about 90 degrees.
  • the lateral face is an arcuate or curved surface.
  • the lateral face is a frusto-cylindrical or frusto-conical surface.
  • the lateral face is an outwardly-curved surface.
  • the lateral face is an inwardly-curved surface.
  • the lenticules each include a curved lenticule surface which extends from the rectilinear surface to the surface of the diffractive element.
  • the curved lenticule surface is a concave surface.
  • the curved lenticule surface is a convex surface.
  • the curved lenticule surface has a radius of from about 20 ⁇ m to about 100 ⁇ m, optionally from about 20 ⁇ m to about 60 ⁇ m.
  • the lenticules are formed by a cutting tool.
  • the cutting tool comprises a frusto-spherical tip, having a flat part which cuts a rectilinear lenticule surface of each of the lenticules and a spherical part which cuts the curved lenticule surface of each of the lenticules.
  • the spherical part has a radius of from about 20 ⁇ m to about 100 ⁇ m, optionally from about 20 ⁇ m to about 60 ⁇ m.
  • the diffractive element is configured to relay the received image to a common point on a viewing plane across the aperture of the diffractive element.
  • the diffractive units are disposed progressively radially outwardly from the optical axis of the diffractive element and configured progressively to provide for an increasing angular offset, such that, independent of location on the aperture of the diffractive element, the received image is relayed to a common point.
  • the progressively-increasing angular offset is provided by forming the lenticules of the diffractive units with increasing angular orientation relative to the optical axis of the diffractive element.
  • the lenticules are formed by inclining a cutting tool with increasing angular orientation relative to the optical axis of the diffractive element as the lenticules are formed progressively radially outwardly from the optical axis of the diffractive element.
  • the optical instrument is a microscope.
  • Figure 1 illustrates a microscope in accordance with a first embodiment of the present invention, in this embodiment a projection microscope.
  • the microscope comprises an objective lens 3 for producing a primary image in an image plane, here a primary image plane PIP, of an object at an object plane OP, in this embodiment as defined by an aperture stop 5.
  • an objective lens 3 for producing a primary image in an image plane, here a primary image plane PIP, of an object at an object plane OP, in this embodiment as defined by an aperture stop 5.
  • the microscope further comprises a projection lens 7 which images the primary image of the objective lens 3 in an image plane, here a secondary image plane SIP, and produces an image of the aperture of the objective lens 3 at the ray vertex 9 of the projection lens 7.
  • a projection lens 7 which images the primary image of the objective lens 3 in an image plane, here a secondary image plane SIP, and produces an image of the aperture of the objective lens 3 at the ray vertex 9 of the projection lens 7.
  • the microscope further comprises a field lens arrangement 11, in this embodiment comprising a pair of field lenses 15, 17, for relaying the secondary image to a viewing plane VP, such as to be viewable by an eye of an observer.
  • a field lens arrangement 11 in this embodiment comprising a pair of field lenses 15, 17, for relaying the secondary image to a viewing plane VP, such as to be viewable by an eye of an observer.
  • the microscope further comprises a diffractive element 25, in this embodiment a transmissive element, which is located at the secondary image plane SIP, here intermediate the field lenses 15, 17 of the field lens arrangement 11, and is effective to produce an array of exit pupils, each corresponding to an exit pupil which would be produced in the absence of the diffractive element 25.
  • a diffractive element 25 in this embodiment a transmissive element, which is located at the secondary image plane SIP, here intermediate the field lenses 15, 17 of the field lens arrangement 11, and is effective to produce an array of exit pupils, each corresponding to an exit pupil which would be produced in the absence of the diffractive element 25.
  • the diffractive element 25 can be configured to provide that the exit pupils in the array of exit pupils are spaced apart or in contact, and the configuration is chosen such that the array of exit pupils appears to the eye of the observer in effect as a single, continuous enlarged exit pupil.
  • the diffractive element 25 comprises a principal surface 37 which has an array of diffractive units 39, each of which generates one of the exit pupils of the array of exit pupils.
  • the profile and form of the individual diffractive units 39 determines the comparative light energy within each of the individual pupil images.
  • the surface 37 is a planar surface. In an alternative embodiment the surface 37 could be a part-spherical surface.
  • the diffractive units 39 each comprise a lenticule 41, which are effective to produce diffractive interference of light passing therethrough and generate a plurality of exit pupils which are displaced relative to one another in the form of an array of exit pupils, such as to be viewable as a single, continuous enlarged exit pupil.
  • the lenticules 41 each comprise an irregular feature which has a plurality of surfaces.
  • the lenticules 41 have substantially a rectangular or square shape at the principal surface 37 of the diffractive element 25.
  • the lenticules 41 are formed on a radial spiral.
  • the lenticules 41 could be formed on concentric circles, which can be rotated about an axis which is off centre of the axis of the concentric circles, thereby avoiding the concentric pattern being observed.
  • the lenticules 41 are formed on a radial spiral at a radial spiral pitch of 60 ⁇ m, and pitched at 69.3 ⁇ m along the spiral.
  • the radial spiral pitch could be from about 40 ⁇ m to about 120 ⁇ m.
  • the pitch along the spiral could be from about 40 ⁇ m to about 120 ⁇ m.
  • the lenticules 41 have a radial width of 55 ⁇ m. In other embodiments the lenticules 41 could have a width of from about 30 ⁇ m to about 100 ⁇ m.
  • the lenticules 41 have an average radial length of 100 ⁇ m. In other embodiments the lenticules 41 could have a width of from about 30 ⁇ m to about 100 ⁇ m.
  • the lenticules 41 each include a first, rectilinear surface 42 which is tapered relative to the principal surface 37 of the diffractive element 25 and defines a lateral face.
  • the tapered surface 42 encloses an angle ⁇ of 80.27 degrees relative to the principal surface 37 of the diffractive element 25. In other embodiments the tapered surface 42 could enclose an angle ⁇ of from about 65 degrees to about 90 degrees relative to the principal surface 37 of the diffractive element 25.
  • the tapered surface 42 is an arcuate or curved surface, here an outwardly-facing, frusto-cylindrical or frusto-conical surface.
  • the tapered surface 42 could be an outwardly-facing, frusto-cylindrical or frusto-conical surface.
  • the lenticules 41 each include a second arcuate or curved surface 43 which extends from the rectilinear surface 42 to the principal surface 37 of the diffractive element 25.
  • the arcuate surface 43 is a concave surface. In another embodiment the arcuate surface 43 could be a convex surface.
  • the arcuate surface 43 has a radius of 1 mm. In other embodiments the arcuate surface 43 has a radius of from about 0.5 mm to about 5 mm, preferably from about 0.5 mm to about 2 mm, more preferably from about 0.5 mm to about 1.5 mm.
  • the lenticules 41 are formed by a cutting tool 51 which is passed over the surface of the diffractive element 25.
  • the tool 51 comprises a frusto-spherical tip 53, having a flat part 55 which cuts the rectilinear surface 42 of each of the lenticules 41 and a spherical surface part 57 which cuts the arcuate surface 43 of each of the lenticules 31.
  • the spherical surface part 57 has a radius of 1 mm, and the flat part 55 is set at 28.6 ⁇ m from the axis of the tool 51.
  • the spherical surface part 57 has a radius of from about 0.5 mm to about 5 mm, preferably from about 0.5 mm to about 2 mm, more preferably from about 0.5 mm to about 1.5 mm.
  • the microscope provides a single, enlarged exit pupil having an effective size corresponding to the array of exit pupils, and the array of exit pupils have improved optical characteristics, particularly in providing for uniform energy distribution of a polychromatic image.
  • Figure 3 illustrates a microscope in accordance with a second embodiment of the present invention.
  • the microscope of this embodiment is similar to the microscope of the first-described embodiment, and thus, in order to avoid duplication of description, only the differences will be described in detail with like parts designating like reference signs.
  • the microscope of this embodiment differs from the first-described embodiment in that the field lens arrangement 11 is omitted, and instead the diffractive element 25 is configured to relay the received image to a common point on the viewing plane VP across the aperture of the diffractive element 25.
  • the diffractive units 39 which are disposed progressively radially outwardly from the optical axis of the diffractive element 25 are configured progressively to provide for an increasing angular offset, such that, independent of location on the diffractive element 25, the received image is relayed to a common point.
  • the progressively-increasing angular offset is provided by forming the lenticules 41 of the diffractive units 39 with increasing angular orientation relative to the optical axis of the diffractive element 25.
  • the lenticules 41 are formed by inclining the cutting tool 51 with increasing angular orientation ⁇ 1 , ⁇ 2 , ⁇ 3 , ..., ⁇ n relative to the optical axis of the diffractive element 25 as the lenticules 41 are formed progressively radially outwardly from the optical axis of the diffractive element 25.
  • the diffractive element 25 is a transmissive element, but it will be understood that the diffractive element 25 could be provided as a reflective element.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Lenses (AREA)
  • Optical Elements Other Than Lenses (AREA)
EP12250162.0A 2012-10-12 2012-10-12 Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element Withdrawn EP2720077A1 (de)

Priority Applications (24)

Application Number Priority Date Filing Date Title
EP12250162.0A EP2720077A1 (de) 2012-10-12 2012-10-12 Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element
DK13721913.5T DK2906986T3 (da) 2012-10-12 2013-04-12 Optisk objektiv med forstørrelse af udgangspupillen ved hjælp af et diffraktivt element
US14/435,364 US10338284B2 (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element with a lenticule comprising an irregular feature
PCT/EP2013/057679 WO2014056631A1 (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element
ES13721913T ES2725327T3 (es) 2012-10-12 2013-04-12 Objetivo óptico con alargamiento de la pupila de salida por medio de un elemento difractivo
CA2888256A CA2888256C (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element
MX2015004666A MX347629B (es) 2012-10-12 2013-04-12 Objeto óptico con ampliación de la pupila de salida por medio de un elemento de difracción.
RU2015115314A RU2623701C2 (ru) 2012-10-12 2013-04-12 Оптические приборы
MYPI2015000944A MY175908A (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element
EP13721913.5A EP2906986B1 (de) 2012-10-12 2013-04-12 Optisches objecktiv mit pupillevergrösserung durch einem diffraktiven element
CN201380056782.4A CN104937474B (zh) 2012-10-12 2013-04-12 通过衍射元件放大出射光瞳的光学透镜
SG11201502895YA SG11201502895YA (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element
KR1020157012266A KR102084487B1 (ko) 2012-10-12 2013-04-12 회절 요소에 의한 사출 동공의 확대를 갖는 광학 물체
BR112015008249-1A BR112015008249B1 (pt) 2012-10-12 2013-04-12 Instrumento óptico para a produção de uma imagem óptica
JP2015536022A JP6770314B2 (ja) 2012-10-12 2013-04-12 回折素子を用いた射出瞳の拡大を伴う光学対象
PT13721913T PT2906986T (pt) 2012-10-12 2013-04-12 Objetiva ótica com aumento da pupila de saída por meio de um elemento de difração
TR2019/07010T TR201907010T4 (tr) 2012-10-12 2013-04-12 Bir kırınım elemanı vasıtasıyla çıkış açıklığının büyütülmesine sahip optik objektif.
AU2013329843A AU2013329843A1 (en) 2012-10-12 2013-04-12 Optical objective with enlargement of the exit pupil by means of a diffractive element
IL238284A IL238284B (en) 2012-10-12 2015-04-14 Optical objective with enlargement of the exit pupil by means of a refractive element
ZA2015/03040A ZA201503040B (en) 2012-10-12 2015-05-04 Optical objective with enlargement of the exit pupil by means of a diffractive element
HK15112472.5A HK1211706A1 (en) 2012-10-12 2015-12-17 Optical objective with enlargement of the exit pupil by means of a diffractive element
AU2017268585A AU2017268585A1 (en) 2012-10-12 2017-11-29 Optical objective with enlargement of the exit pupil by means of a diffractive element
CY20191100468T CY1121752T1 (el) 2012-10-12 2019-05-03 Οπτικο αντικειμενο με διευρυνση της κορης εξοδου μεσω ενος περιθλαστικου στοιχειου
AU2019271926A AU2019271926B2 (en) 2012-10-12 2019-11-26 Optical objective with enlargement of the exit pupil by means of a diffractive element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12250162.0A EP2720077A1 (de) 2012-10-12 2012-10-12 Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element

Publications (1)

Publication Number Publication Date
EP2720077A1 true EP2720077A1 (de) 2014-04-16

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP12250162.0A Withdrawn EP2720077A1 (de) 2012-10-12 2012-10-12 Optisches Objecktiv mit Pupillevergrösserung durch einem Diffraktiven Element
EP13721913.5A Active EP2906986B1 (de) 2012-10-12 2013-04-12 Optisches objecktiv mit pupillevergrösserung durch einem diffraktiven element

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13721913.5A Active EP2906986B1 (de) 2012-10-12 2013-04-12 Optisches objecktiv mit pupillevergrösserung durch einem diffraktiven element

Country Status (21)

Country Link
US (1) US10338284B2 (de)
EP (2) EP2720077A1 (de)
JP (1) JP6770314B2 (de)
KR (1) KR102084487B1 (de)
CN (1) CN104937474B (de)
AU (3) AU2013329843A1 (de)
BR (1) BR112015008249B1 (de)
CA (1) CA2888256C (de)
CY (1) CY1121752T1 (de)
DK (1) DK2906986T3 (de)
ES (1) ES2725327T3 (de)
HK (1) HK1211706A1 (de)
IL (1) IL238284B (de)
MX (1) MX347629B (de)
MY (1) MY175908A (de)
PT (1) PT2906986T (de)
RU (1) RU2623701C2 (de)
SG (1) SG11201502895YA (de)
TR (1) TR201907010T4 (de)
WO (1) WO2014056631A1 (de)
ZA (1) ZA201503040B (de)

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US10067347B2 (en) 2016-04-13 2018-09-04 Microsoft Technology Licensing, Llc Waveguides with improved intensity distributions
US9791703B1 (en) 2016-04-13 2017-10-17 Microsoft Technology Licensing, Llc Waveguides with extended field of view
US9939647B2 (en) 2016-06-20 2018-04-10 Microsoft Technology Licensing, Llc Extended field of view in near-eye display using optically stitched imaging
US10095045B2 (en) 2016-09-12 2018-10-09 Microsoft Technology Licensing, Llc Waveguide comprising a bragg polarization grating
US10412378B2 (en) 2017-05-08 2019-09-10 Microsoft Technology Licensing, Llc Resonating optical waveguide using multiple diffractive optical elements
US10222615B2 (en) 2017-05-26 2019-03-05 Microsoft Technology Licensing, Llc Optical waveguide with coherent light source

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US6028704A (en) 1993-05-17 2000-02-22 Freeman; Robin John Optical instrument and optical element thereof
US6608720B1 (en) 1997-06-02 2003-08-19 Robin John Freeman Optical instrument and optical element thereof
US7123415B2 (en) 2000-03-20 2006-10-17 Vision Engineering Limited Optical instrument and optical element providing expanded exit pupil

Also Published As

Publication number Publication date
KR20150100631A (ko) 2015-09-02
MY175908A (en) 2020-07-15
JP2015532463A (ja) 2015-11-09
RU2623701C2 (ru) 2017-06-28
IL238284A0 (en) 2015-06-30
CA2888256C (en) 2020-11-24
CN104937474B (zh) 2019-07-09
US10338284B2 (en) 2019-07-02
EP2906986A1 (de) 2015-08-19
MX2015004666A (es) 2015-11-09
EP2906986B1 (de) 2019-02-20
AU2013329843A1 (en) 2015-05-28
RU2015115314A (ru) 2016-12-10
ZA201503040B (en) 2017-09-27
TR201907010T4 (tr) 2019-06-21
WO2014056631A1 (en) 2014-04-17
US20150234101A1 (en) 2015-08-20
AU2019271926A1 (en) 2019-12-19
IL238284B (en) 2019-08-29
ES2725327T3 (es) 2019-09-23
BR112015008249B1 (pt) 2021-11-16
AU2019271926B2 (en) 2021-04-01
BR112015008249A2 (pt) 2017-07-04
AU2017268585A1 (en) 2017-12-21
DK2906986T3 (da) 2019-05-13
SG11201502895YA (en) 2015-06-29
HK1211706A1 (en) 2016-05-27
PT2906986T (pt) 2019-05-30
KR102084487B1 (ko) 2020-03-04
CN104937474A (zh) 2015-09-23
CA2888256A1 (en) 2014-04-17
MX347629B (es) 2017-05-04
CY1121752T1 (el) 2020-07-31
JP6770314B2 (ja) 2020-10-14

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